A controversial study saying "strenuous
jogging" is unhealthy is misleading, says Derby expert Rob Jefferies.
I NEED to tell everyone to stop running right now! It's bad for you. Well, that seems to be what is being suggested lately, according to some of the wider press!
A recently-published scientific study in the Journal of the American College of Cardiology claims to have results which suggest too much 'strenuous' running is just as bad for you as not running at all, as it shortens life expectancy. I have my doubts about these claims of course. I will try to explain why.
The piece of work in question involved Danish researchers, studying 1,000 people over a 12-year period.
These subjects were placed into one of four groups; Non-joggers; light-joggers; moderate-joggers; and strenuous-joggers. The running categories were based upon the subject's responses to questions about the speed, frequency and duration of their training sessions.
Ten years later, the researchers checked government records to see how many of them had died.
They found that the rate of death was highest among the group they classed as 'strenuous-joggers', with the lowest rate occurring in the light and moderate joggers.
In the conclusion of the study, it was suggested that running for more than 2.5 hours per week at a speed of 7mph or more was associated with increased chances of dying. It is this that led the wider press to interpret the study's findings in their own unique way and produce headlines along the lines of 'Fast running as deadly as sitting on the couch' and 'You will die if you keep running so much'.
As a runner and someone who comes from a scientific background, I am always interested in scientific studies which relate to my sport.
However, I learned a long time ago that some newspapers, social media and TV news bulletins are NOT the best source for obtaining accurate results of such studies.
What the majority of the wider press failed to mention when publishing their story on the results of this study are the limitations of its validity.
They do not mention that of the 1,000 participants, only 40 were able to be classified as a "strenuous jogger".
They do not mention that of the 1,000 participants, only 17 died in the ten-year study, or that only two of these 17 were in the strenuous jogging group.
They do not mention that the study fails to report whether the deaths of these two subjects were even related to exercise (they could have died in a plane crash for all we know).
My main point here isn't necessarily that I do not agree that running more than 2.5 hours per week is bad for you (although I don't). No. My point is: Please do not make decisions based solely upon what you read in the paper or hear on the news. It's always worth looking at the underlying facts.
Now I have ran for more than 2.5 hours each week since I was around 14 (more than 20 years) and plenty of that has been at significantly faster than 7mph.
I have written in previous articles in the Derby Telegraph about the benefits to physical and mental health that running brings.
However, even if there was suddenly a new piece of groundbreaking research that discovers I have shortened my life in doing so I would have much rather spent my time on this earth being a fast runner, than a couch potato.
Quality of life is surely just as important as longevity. Besides, what on earth is a strenuous jog?
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